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A current is passed through two voltmeters connected in series. The first voltmeter contains XSO4 (aq) while the second voltmeter contains Y2SO4 (aq). The relative atomic masses of X and Y are in the ratio of 2:1. The ratio of the mass of X liberated to the mass of Y liberated is:

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Important Questions on Electrochemistry

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Calculate the volume of hydrogen at NTP, obtained by passing a current of 0.4 ampere through acidified water for 30 minutes.
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Aluminium oxide may be electrolyzed at 1000°C to furnish aluminium metal.

(Atomic mass =27 amu1 Faraday =96500 C) The cathode reaction is: Al3++3e-Al.

To prepare 5.12 kg of aluminium metal by this method would require:

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Electrolysis is carried out in three cells: (1) 1.0 M CuSO4, Pt electrodes; (2) 1.0 M CuSO4, Copper electrodes; 3 1.0 M KCl, Pt electrodes. If the volume of the electrolytic solution is maintained constant in each of the cells, which is the correct set of pH changes in 1, 2 and 3 cells respectively?
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Which of the following is strongly electropositive?
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Corrosion is basically a/an__________.
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According to the electrochemical theory of corrosion, metal undergoing corrosion acts as______. 
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The most durable metal-plating on iron to protect against corrosion is_______plating.
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Which of the following represents the process of passivation?